15 results on '"Eguizabal, Cristina"'
Search Results
2. Natural killer cell subsets in endometrial fluid: a pilot study of their association with the endometrial cycle and reproductive parameters.
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Herrera, Lara, Martin-Inaraja, Myriam, Bengoetxea, Ainara, Vendrell, Alberto, Pérez-Fernández, Silvia, Eguizabal, Cristina, and Matorras, Roberto
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SEXUAL cycle , *MENSTRUAL cycle , *ENDOMETRIUM , *DECIDUA , *KILLER cells , *LUTEAL phase , *CELL populations , *EMBRYO implantation - Abstract
Purpose: To investigate if there are natural killer (NK) cells in endometrial fluid (EF) and their relationship with the endometrial cycle and reproductive parameters. Methods: The population under study consisted of 43 women aged 18–40 undergoing infertility workup at our University Hospital in 2021–2022. The EF samples were obtained at the first visit to our unit, on occasion of the mock embryo transfer. The day of the cycle was considered only in cycles of 27–29 days. An immunophenotype study of NK in EF was performed by flow cytometry analysis. In a subgroup of women, on the same day, NK was studied in EF and peripheral blood. Results: Our study is the first to evidence NK cells in EF. None of the NK cells observed corresponded to a mature peripheral blood NK cell population (stages 4–5), and neither endometrial nor decidual uNK cells were detected. Nevertheless, we found 2 patient groups with an NK cell subset with a higher expression of CD16+, which could belong to an intermediate or transient stage between the uNK and pbNK NK cell population in the EF. We found that CD16 was significantly increased in the mid-late luteal phase and its correlation with the day of the cycle. The NK immunophenotype was different in EF and peripheral blood. Conclusion: We described a new component of the EF, the NK cells, whose CD16 activity is closely correlated with the day of the cycle. These cells could play a role in implantation/implantation failure. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Characterization of the novel HLA‐A*80:04 allele identified in a Spanish volunteer donor.
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Santos, Silvia, Rodriguez, Clara, Eguizabal, Cristina, Balas, Antonio, and Vicario, José L.
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HLA histocompatibility antigens , *ALLELES , *AMINO acids , *NUCLEOTIDE sequence , *HAPLOTYPES - Abstract
HLA‐A*80:04 shows one amino acid replacement, A76 > E, when compared with the A*80:01 allele. [ABSTRACT FROM AUTHOR]
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- 2018
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4. Migrations and Borders in Central America.
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Eguizabal, Cristina
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EMIGRATION & immigration , *GEOGRAPHIC boundaries - Abstract
There are several Central Americas. Geographical Central America that includes Southern Mexico, Belize and that borders Colombia; historical Central America which includes Guatemala, El Salvador, Honduras, Nicaragua and Costa Rica united by the Central American Integration System There is the Northern Central American Triangle formed by Guatemala, El Salvador and Honduras that have established an open borders policy. There is Diasporic Central America which includes Central American communities in the United States and the linkages that they have kept with their original communities. There is Afro Central America concentrated on the Atlantic coast, and there is Indigenous Central America on the Pacific highlands. There are âbordersâ â"official and unofficial-- separating all of these Central Americas and there are peoples crossing those borders and connecting all these different realities. In my paper I will analyze the movements of people that criss-cross the region and link it to the U.S. via Mexico. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]
- Published
- 2008
5. The Biology and Disease Relevance of CD300a, an Inhibitory Receptor for Phosphatidylserine and Phosphatidylethanolamine.
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Zenarruzabeitia, Olatz, Vitallé, Joana, Eguizabal, Cristina, Simhadri, Venkateswara R., and Borrego, Francisco
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CELL membranes , *PHOSPHATIDYLSERINES , *PHOSPHATIDYLETHANOLAMINES , *CELL communication , *PHOSPHORYLATION , *CHRONIC diseases - Abstract
The CD300a inhibitory receptor belongs to the CD300 family of cell surface molecules that regulate a diverse array of immune cell processes. The inhibitory signal of CD300a depends on the phosphorylation of tyrosine residues embedded in ITIMs of the cytoplasmic tail. CD300a is broadly expressed on myeloid and lymphoid cells, and its expression is differentially regulated depending on the cell type. The finding that CD300a recognizes phosphatidylserine and phosphatidylethanolamine, two aminophospholipids exposed on the outer leaflet of dead and activated cells, has shed new light on its role in the modulation of immune functions and in its participation in the host response to several diseases states, such as infectious diseases, cancer, allergy, and chronic inflammatory diseases. This review summarizes the literature on CD300a expression, regulation, signaling pathways, and ligand interaction, as well as its role in fine tuning immune cell functions and its clinical relevance. [ABSTRACT FROM AUTHOR]
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- 2015
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6. Identifying SARS‐CoV‐2 'memory' NK cells from COVID‐19 convalescent donors for adoptive cell therapy.
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Herrera, Lara, Martin‐Inaraja, Myriam, Santos, Silvia, Inglés‐Ferrándiz, Marta, Azkarate, Aida, Perez‐Vaquero, Miguel A., Vesga, Miguel A., Vicario, Jose L., Soria, Bernat, Solano, Carlos, De Paz, Raquel, Marcos, Antonio, Ferreras, Cristina, Perez‐Martinez, Antonio, and Eguizabal, Cristina
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KILLER cells , *CELLULAR therapy , *SARS-CoV-2 , *COVID-19 , *CYTOMEGALOVIRUS diseases - Abstract
COVID‐19 disease is the manifestation of syndrome coronavirus 2 (SARS‐CoV‐2) infection, which is causing a worldwide pandemic. This disease can lead to multiple and different symptoms, being lymphopenia associated with severity one of the most persistent. Natural killer cells (NK cells) are part of the innate immune system, being fighting against virus‐infected cells one of their key roles. In this study, we determined the phenotype of NK cells after COVID‐19 and the main characteristic of SARS‐CoV‐2‐specific‐like NK population in the blood of convalescent donors. CD57+ NKG2C+ phenotype in SARS‐CoV‐2 convalescent donors indicates the presence of 'memory'/activated NK cells as it has been shown for cytomegalovirus infections. Although the existence of this population is donor dependent, its expression may be crucial for the specific response against SARS‐CoV‐2, so that, it gives us a tool for selecting the best donors to produce off‐the‐shelf living drug for cell therapy to treat COVID‐19 patients under the RELEASE clinical trial (NCT04578210). [ABSTRACT FROM AUTHOR]
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- 2022
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7. Transcriptional progression during meiotic prophase I reveals sex-specific features and X chromosome dynamics in human fetal female germline.
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Fan, Xueying, Moustakas, Ioannis, Torrens-Juaneda, Vanessa, Lei, Qijing, Hamer, Geert, Louwe, Leoni A., Pilgram, Gonneke S. K., Szuhai, Karoly, Matorras, Roberto, Eguizabal, Cristina, Westerlaken, Lucette van der, Mei, Hailiang, and Chuva de Sousa Lopes, Susana M.
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X chromosome , *MEIOSIS , *HUMAN chromosomes , *Y chromosome , *SEXUAL dimorphism , *SPERMATOZOA - Abstract
During gametogenesis in mammals, meiosis ensures the production of haploid gametes. The timing and length of meiosis to produce female and male gametes differ considerably. In contrast to males, meiotic prophase I in females initiates during development. Hence, the knowledge regarding progression through meiotic prophase I is mainly focused on human male spermatogenesis and female oocyte maturation during adulthood. Therefore, it remains unclear how the different stages of meiotic prophase I between human oogenesis and spermatogenesis compare. Analysis of single-cell transcriptomics data from human fetal germ cells (FGC) allowed us to identify the molecular signatures of female meiotic prophase I stages leptotene, zygotene, pachytene and diplotene. We have compared those between male and female germ cells in similar stages of meiotic prophase I and revealed conserved and specific features between sexes. We identified not only key players involved in the process of meiosis, but also highlighted the molecular components that could be responsible for changes in cellular morphology that occur during this developmental period, when the female FGC acquire their typical (sex-specific) oocyte shape as well as sex-differences in the regulation of DNA methylation. Analysis of X-linked expression between sexes during meiotic prophase I suggested a transient X-linked enrichment during female pachytene, that contrasts with the meiotic sex chromosome inactivation in males. Our study of the events that take place during meiotic prophase I provide a better understanding not only of female meiosis during development, but also highlights biomarkers that can be used to study infertility and offers insights in germline sex dimorphism in humans. Author summary: Meiosis is a specialized and strictly-regulated cellular process and any genetic defects that emerge during meiotic prophase I may lead to the defective development of the gametes. These defects will result in either infertility or genetic diseases in the offspring, with significant consequences for the quality of life. We have limited understanding of the events that take place during human female meiotic prophase I, as it largely takes place during development. However, sequencing technologies are providing essential knowledge of this process. Here, we have analysed single-cell RNA sequencing data of human germ cells and identified the molecular signatures associated with progression through the different stages of the female meiotic prophase I. Interestingly, we observed that many genes differentially expressed during different female meiotic prophase I stages are related to male fertility. To further uncover sex-specific and conserved features, we have also compared female to male germ cells during meiotic prophase I. Our study fills an important gap regarding the events that take place during human female meiotic progression and highlights biomarkers that may prove important to develop infertility-associated disease models in vitro. [ABSTRACT FROM AUTHOR]
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- 2021
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8. Evaluation of the Spanish population coverage of a prospective HLA haplobank of induced pluripotent stem cells.
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Álvarez-Palomo, Belén, García-Martinez, Iris, Gayoso, Jorge, Raya, Angel, Veiga, Anna, Abad, María Luisa, Eiras, Adolfo, Guzmán-Fulgencio, María, Luis-Hidalgo, Mar, Eguizabal, Cristina, Santos, Silvia, Balas, Antonio, Alenda, Raquel, Sanchez-Gordo, Francisco, Verdugo, Laura Ponce, Villa, Juliana, Carreras, Enric, Vidal, Francisco, Madrigal, Alejandro, and Herrero, María José
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INDUCED pluripotent stem cells , *CORD blood , *PLURIPOTENT stem cells , *HLA histocompatibility antigens , *BLOOD banks - Abstract
Background: iPSC (induced pluripotent stem cells) banks of iPSC lines with homozygous HLA (human leukocyte antigen) haplotypes (haplobanks) are proposed as an affordable and off-the-shelf approach to allogeneic transplantation of iPSC derived cell therapies. Cord blood banks offer an extensive source of HLA-typed cells suitable for reprogramming to iPSC. Several initiatives worldwide have been undertaken to create national and international iPSC haplobanks that match a significant part of a population. Methods: To create an iPSC haplobank that serves the Spanish population (IPS-PANIA), we have searched the Spanish Bone Marrow Donor Registry (REDMO) to identify the most frequently estimated haplotypes. From the top ten donors identified, we estimated the population coverage using the criteria of zero mismatches in HLA-A, HLA-B, and HLA-DRB1 with different stringencies: high resolution, low resolution, and beneficial mismatch. Results: We have calculated that ten cord blood units from homozygous donors stored at the Spanish cord blood banks can provide HLA-A, HLA-B, and HLA-DRB1 matching for 28.23% of the population. Conclusion: We confirm the feasibility of using banked cord blood units to create an iPSC haplobank that will cover a significant percentage of the Spanish and international population for future advanced therapy replacement strategies. [ABSTRACT FROM AUTHOR]
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- 2021
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9. How donor selection criteria can be evaluated with limited scientific evidence: lessons learned from the TRANSPOSE project.
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Mikkelsen, Christina, Mori, Gaia, Walraven, Suzanna M., Castrén, Johanna, Zahra, Sharon, MacLennan, Sheila, Seidel, Kirsten, Fontana, Stefano, Veropalumbo, Eva, Cannata, Livia, Pupella, Simonetta, Kvist, Maria, Happel, Marjan, Korkalainen, Piia, Chandrasekar, Akila, Paulus, Ulrike, Bokhorst, Arlinke, Wulff, Birgit, Fernandez‐Sojo, Jesus, and Eguizabal, Cristina
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PRECAUTIONARY principle , *HUMAN origins , *EVIDENCE , *RISK assessment , *DECISION making - Abstract
Background and objective: Donor selection criteria (DSC) are a vital link in the chain of supply of Substances of Human Origin (SoHO) but are also subject to controversy and differences of opinion. Traditionally, DSC have been based on application of the precautionary principle. Materials and methods: From 2017 to 2020, TRANSPOSE (TRANSfusion and transplantation PrOtection and SElection of donors), a European research project, aimed to identify discrepancies between current DSC by proposing a standardized risk assessment method for all SoHO (solid organs excluded) and all levels of evidence. Results: The current DSC were assessed using a modified risk assessment method based on the Alliance of Blood Operators' Risk‐based decision‐making framework for blood safety. It was found that with limited or diverging scientific evidence, it was difficult to reach consensus and an international standardized method for decision‐making was lacking. Furthermore, participants found it hard to disregard their local guidelines when providing expert opinion, which resulted in substantial influence on the consensus‐based decision‐making process. Conclusions: While the field of donation‐safety research is expanding rapidly, there is an urgent need to formalize the decision‐making process regarding DSC. This includes the need for standardized methods to increase transparency in the international decision‐making process and to ensure that this is performed consistently. Our framework provides an easy‐to‐implement approach for standardizing risk assessments, especially in the context of limited scientific evidence. [ABSTRACT FROM AUTHOR]
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- 2021
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10. Putting the spotlight on donation‐related risks and donor safety – are we succeeding in protecting donors?
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Mikkelsen, Christina, Mori, Gaia, Walraven, Suzanna M., Castrén, Johanna, Zahra, Sharon, MacLennan, Sheila, Seidel, Kirsten, Fontana, Stefano, Veropalumbo, Eva, Cannata, Livia, Pupella, Simonetta, Kvist, Maria, Happel, Marjan, Korkalainen, Piia, Wulff, Birgit, Fernandez‐Sojo, Jesus, Eguizabal, Cristina, Urbano, Fernando, Vesga, Miguel Angel, and Pozenel, Primoz
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STEM cell donors , *HUMAN origins , *GAMETES - Abstract
Background and objective: The European consortium project TRANSPOSE (TRANSfusion and transplantation: PrOtection and SElection of donors) aimed to assess and evaluate the risks to donors of Substances of Human Origin (SoHO), and to identify gaps between current donor vigilance systems and perceived risks. Materials and methods: National and local data from participating organizations on serious and non‐serious adverse reactions in donors were collected from 2014 to 2017. Following this, a survey was performed among participants to identify risks not included in the data sets. Finally, participants rated the risks according to severity, level of evidence and prevalence. Results: Significant discrepancies between anticipated donor risks and the collected data were found. Furthermore, many participants reported that national data on adverse reactions in donors of stem cells, gametes, embryos and tissues were not routinely collected and/or available. Conclusions: These findings indicate that there is a need to further develop and standardize donor vigilance in Europe and to include long‐term risks to donors, which are currently underreported, ensuring donor health and securing the future supply of SoHO. [ABSTRACT FROM AUTHOR]
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- 2021
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11. TET2 controls chemoresistant slow-cycling cancer cell survival and tumor recurrence.
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Puig, Isabel, Tenbaum, Stephan P., Chicote, Irene, Arqués, Oriol, Martínez-Quintanilla, Jordi, Cuesta-Borrás, Estefania, Ramírez, Lorena, Gonzalo, Pilar, Soto, Atenea, Aguilar, Susana, Eguizabal, Cristina, Caratù, Ginevra, Prat, Aleix, Argilés, Guillem, Landolfi, Stefania, Casanovas, Oriol, Serra, Violeta, Villanueva, Alberto, Arroyo, Alicia G., and Terracciano, Luigi
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CANCER cells , *ADJUVANT treatment of cancer , *GENE expression , *CANCER relapse , *BIOLOGICAL tags - Abstract
Dormant or slow-cycling tumor cells can form a residual chemoresistant reservoir responsible for relapse in patients, years after curative surgery and adjuvant therapy. We have adapted the pulse-chase expression of H2BeGFP for labeling and isolating slow-cycling cancer cells (SCCCs). SCCCs showed cancer initiation potential and enhanced chemoresistance. Cells at this slow-cycling status presented a distinctive nongenetic and cell-autonomous gene expression profile shared across different tumor types. We identified TET2 epigenetic enzyme as a key factor controlling SCCC numbers, survival, and tumor recurrence. 5-Hydroxymethylcytosine (5hmC), generated by TET2 enzymatic activity, labeled the SCCC genome in carcinomas and was a predictive biomarker of relapse and survival in cancer patients. We have shown the enhanced chemoresistance of SCCCs and revealed 5hmC as a biomarker for their clinical identification and TET2 as a potential drug target for SCCC elimination that could extend patients' survival. [ABSTRACT FROM AUTHOR]
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- 2018
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12. Human-specific subcellular compartmentalization of P-element induced wimpy testis-like (PIWIL) granules during germ cell development and spermatogenesis.
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Gomes Fernandes, Maria, Nannan He, Fang Wang, Van Iperen, Liesbeth, Eguizabal, Cristina, Matorras, Roberto, Roelen, Bernard A. J., De Sousa Lopes, Susana M. Chuva, He, Nannan, Wang, Fang, and Chuva De Sousa Lopes, Susana M
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GRANULE cells , *GERM cells , *SPERMATOGENESIS , *FETAL development , *MEIOSIS , *MALE infertility , *PHYSIOLOGY - Abstract
Study Question: What is the dynamics of expression of P-element induced wimpy testis-like (PIWIL) proteins in the germline during human fetal development and spermatogenesis?Summary Answer: PIWIL1, PIWIL2, PIWIL3 and PIWIL4 were expressed in a sex-specific fashion in human germ cells (GC) during development and adulthood. PIWILs showed a mutually exclusive pattern of subcellular localization. PIWILs were present in the intermitochondrial cement and a single large granule in meiotic GC and their expression was different from that observed in mice, highlighting species-differences.What Is Known Already: In mice, PIWIL proteins play prominent roles in male infertility. PIWIL mouse mutants show either post-meiotic arrest at the round spermatid stage (PIWIL1) or arrest at the zygotene-pachytene stage of meiosis I (PIWIL2 and PIWIL4) in males, while females remain fertile. Recent studies have reported a robust piRNA pool in human fetal ovary.Study Design, Size, Duration: This is a qualitative analysis of PIWILs expression in paraffin-embedded fetal human male (N = 8), female gonads (N = 6) and adult testes (N = 5), and bioinformatics analysis of online available single-cell transcriptomics data of human fetal germ cells (n = 242).Participants/materials, Setting, Methods: Human fetal gonads from elective abortion without medical indication and adult testes biopsies were donated for research with informed consent. Samples were fixed, paraffin-embedded and analyzed by immunofluorescence to study the temporal and cellular localization of PIWIL1, PIWIL2, PIWIL3 and PIWIL4.Main Results and the Role Of Chance: PIWIL1, PIWIL2 and PIWIL4 showed a mutually exclusive pattern of subcellular localization, particularly in female oocytes. To our surprise, PIWIL1 immunostaining revealed the presence of a single dense paranuclear body, resembling the chromatoid body of haploid spermatocytes, in meiotic oocytes. Moreover, in contrast to mice, PIWIL4, but not PIWIL2, localized to the intermitochondrial cement. PIWIL3 was not expressed in GC during development. The upregulation of PIWIL transcripts correlated with the transcription of markers associated with piRNAs biogenesis like the TDRDs and HENMT1 in fetal GC.Large Scale Data: Non-applicable.Limitations, Reasons For Caution: This study is limited by the restricted number of samples and consequently stages analyzed.Wider Implications Of the Findings: In the germline, PIWILs ensure the integrity of the human genome protecting it from 'parasitic sequences'. This study offers novel insights on the expression dynamics of PIWILs during the window of epigenetic remodeling and meiosis, and highlights important differences between humans and mice, which may prove particularly important to understand causes of infertility and improve both diagnosis and treatment in humans.Study Funding/competing Interest(s): M.G.F. was funded by Fundação para a Ciência e Tecnologia (FCT) [SFRH/BD/78689/2011]; N.H. by China Scholarship Council (CSC) [No. 201307040026] and F.W. by Medical Personnel Training Abroad Project of Henan Province [No. 2015022] and S.M.C.d.S.L. by the Netherlands Organization of Scientific Research (NWO) [ASPASIA 015.007.037] and the Interuniversity Attraction Poles-Phase VII [IUAP/PAI P7/14]. The authors have no conflicts of interest to declare. [ABSTRACT FROM AUTHOR]- Published
- 2018
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13. The Race of CAR Therapies: CAR-NK Cells for Fighting B-Cell Hematological Cancers.
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Herrera, Lara, Santos, Silvia, Vesga, Miguel Angel, Carrascosa, Tomas, Garcia-Ruiz, Juan Carlos, Pérez-Martínez, Antonio, Juan, Manel, and Eguizabal, Cristina
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THERAPEUTIC use of antineoplastic agents , *B cell lymphoma , *KILLER cells , *CELL receptors , *CANCER relapse , *TREATMENT effectiveness , *HEMATOLOGIC malignancies , *T cells , *IMMUNOTHERAPY , *MEDICAL research , *EVALUATION - Abstract
Simple Summary: Over the last few years, CAR-T cells have arisen as one of the most promising immunotherapies against relapsed or refractory hematological cancers. Despite their good results in clinical trials, there are some limitations to overcome, such as undesirable side-effects or the restraints of an autologous treatment. Therefore, CAR-NK cells have emerged as a good alternative for these kinds of treatments. This review discusses the advantages of CAR-NK cells compared to CAR-T cells, as well as the different sources and strategies in order to obtain these CAR-NK cells. Acute lymphoblastic leukemia (ALL) and Chronic lymphocytic leukemia (CLL) are the most common leukemias in children and elderly people, respectively. Standard therapies, such as chemotherapy, are only effective in 40% of ALL adult patients with a five-year survival rate and therefore new alternatives need to be used, such as immunotherapy targeting specific receptors of malignant cells. Among all the options, CAR (Chimeric antigen receptor)-based therapy has arisen as a new opportunity for refractory or relapsed hematological cancer patients. CARs were designed to be used along with T lymphocytes, creating CAR-T cells, but they are presenting such encouraging results that they are already in use as drugs. Nonetheless, their side-effects and the fact that it is not possible to infuse an allogenic CAR-T product without causing graft-versus-host-disease, have meant using a different cell source to solve these problems, such as Natural Killer (NK) cells. Although CAR-based treatment is a high-speed race led by CAR-T cells, CAR-NK cells are slowly (but surely) consolidating their position; their demonstrated efficacy and the lack of undesirable side-effects is opening a new door for CAR-based treatments. CAR-NKs are now in the field to stay. [ABSTRACT FROM AUTHOR]
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- 2021
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14. Improving In Vitro Culture of Human Male Fetal Germ Cells.
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Martin-Inaraja, Myriam, Ferreira, Monica, Taelman, Jasin, Eguizabal, Cristina, and Chuva De Sousa Lopes, Susana M.
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SPERMATOZOA , *FERTILITY preservation , *STEM cells , *VITRONECTIN , *ADULTS , *GERM cells , *CELL culture - Abstract
Male human fetal germ cells (hFGCs) give rise to spermatogonial stem cells (SSCs), which are the adult precursors of the male gametes. Human SSCs are a promising (autologous) source of cells for male fertility preservation; however, in contrast to mouse SSCs, we are still unable to culture them in the long term. Here, we investigated the effect of two different culture media and four substrates (laminin, gelatin, vitronectin and matrigel) in the culture of dissociated second trimester testes, enriched for hFGCs. After 6 days in culture, we quantified the presence of POU5F1 and DDX4 expressing hFGCs. We observed a pronounced difference in hFGC number in different substrates. The combination of gelatin-coated substrate and medium containing GDNF, LIF, FGF2 and EGF resulted in the highest percentage of hFGCs (10% of the total gonadal cells) after 6 days of culture. However, the vitronectin-coated substrate resulted in a comparable percentage of hFGCs regardless of the media used (3.3% of total cells in Zhou-medium and 4.8% of total cells in Shinohara-medium). We provide evidence that not only the choices of culture medium but also choices of the adequate substrate are crucial for optimizing culture protocols for male hFGCs. Optimizing culture conditions in order to improve the expansion of hFGCs will benefit the development of gametogenesis assays in vitro. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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15. The expression and function of human CD300 receptors on blood circulating mononuclear cells are distinct in neonates and adults.
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Zenarruzabeitia, Olatz, Vitallé, Joana, García-Obregón, Susana, Astigarraga, Itziar, Eguizabal, Cristina, Santos, Silvia, Simhadri, Venkateswara R., and Borrego, Francisco
- Published
- 2016
- Full Text
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